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Finding the Third Proportional to 420,122 and 921,879

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Solution

The third proportional to 420,122 and 921,879 is: 2,022,890.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,122 : 921,879 = 921,879 : x
  2. Step 2: Convert to fraction form
    420,122/921,879 = 921,879/x
  3. Step 3: Cross multiply
    420,122x = 921,879 × 921,879
  4. Step 4: Simplify right side
    420,122x = 849,860,890,641
  5. Step 5: Solve for x
    x = 849,860,890,641/420,122
  6. Step 6: Final answer
    x = 2,022,890.71

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.